Safe filling



O. COMPOSITIONS, COATING R PLASTIC.

ratented June l, 1vz9."" I 1,715,977

UNITED STATES PATENT OFFICE.

CHARLES T. BATES, JR... 0]! ENGLEWOOD, NEW JERSEY, AND CARL I. BARTELS, OI

HAMILTON, OHIO, ASSIGNORS, TO THE MOSLER SAFE COMPANY, OF HAMILTON, OHIO, A CORRORATION OF NEW YORK.

SAFE FILLING.

No Drawing. Application filed June 24, 1926. Serial No. 118,385.

Vermiculite material may be combined with cement in any proportion desired. The greater the proportion of vermiculite the lighter the filling will be in weight. The smaller the proportion of vermiculite, the more chemically bound water will be contained in the filling for release when a fire hazard is encountered.

A mixture of vermiculite material and calc1ned powdered diatomaceous earth and a binder, such as cement, plaster of Paris, or the like, makes a very efiective heat-insulating filling for safes, or similar structures. Here, again, the proportions of the materials may be varied widely. As a specific example of one of many formulas for making satisfactory safe fillings, usin a vermiculite material such as j efi'crisite, kerr itamm might mention a filling made up of one part This invention relates to fireproof safes, and more particularly relates to heat-insw lating filling material for the walls thereof.

It is well recognized that cement has very valuable and desirable heat-insulating characteristics, which to some extent are attributable to the amount of moisture which is chemically held in the material and becomes released under high temperatures to increase the resistance to heat penetration. The moisture so held will not evaporate or become lost, and, therefore, the heat-insulating prop erties of cement will not deteriorate. Cement has the further advantage of being structurally strong. However, cement has certain objectionable features. It is very heavy, and when subjected to high temperatures is liable to crack and thus form openings through which heat may travel and cause damage to the contents of the safe. by volume each of Portland cement, a ver- The principal object of this invention is to ml ullte preferably Broken down to onea provide a fillin material for safes, or other 11105 1 less, and calcined owdered diatostructures, whic has improved heat-insulat- 11 0118 e rth- In app ylng e ing 0 a ing characteristics, and at the same time will fe, water is added until the mixture has not crack open when subjected to high temthe desire egree of plasticity, whereupon it peratures, A f th bj t f thi i is poured between the walls of the safe and tion is to provide a safe filling of the characallowed to set. The manner of filling is the ter described, which is comparatively light in same as that employed when only cement is weight and may be applied easily to the walls edof safes, or other structures. A further ob- The dlatomaceous earth may be used unject of this invention is to provide a material lcined instead of calcined, or may be of the character described, which has no omitted entirely. The presence of diatomad trimental eife t on the metal wall with ceous earth serves to counteract any tendency which the filling is in contact. A further obof the mixture to spall ofi or explode when ject of this invention is to provide a filling subjected to the intense temperatures of a of the character described, which holds its Moreover the material is lightinweight heat-insulating properties indefinitely and and possesses valuable heat insulating and practically without deterioration. heat resisting characteristics.

Other objects of this invention will be in As before stated, a vermiculite is a highly part obvious and in part pointed out hereininsulating material of itself, and is extremely ft light in weight. Both of these characteristics 05 We have discovered that a filling having are highly desirable in safe fillings. When all the desirable characteristics of a cement used with cement, it permits the incorporafilling and lacking all of the objectionable tion of more cement per cubic foot, without features thereof may be provided by incorpothe danger of the cement opening up cracks rating a vermiculite in the cement mixture, under high temperatures, and without interthe vermiculite preferably having been heated faring with the release of the chemically to open out the scales. Besides, vermiculites bound water from the cement by the heat of have superior heat-insulating properties in a fire. Vermiculite material has a further themselves especially on account of the air advantage of permitting the incorporation in cells encased therein, and are light in weight, the filling of other insulating materials, such especially after being heated. Accordingly, as diatomaceous earth and the like. vermiculites constitute superior material for As many chan es could be made in the use in safe fillings. above filling wit out departing from the mine mixture from spalling oil when subjected to the heat of a conflagration.

4. A heat insulating filling for safes and the like, which includes the mixture of a cement-like substance, vermiculite material, 20

and diatomaceous material, the vermiculite material tending to prevent the opening of cracks through the filling, and the diatoms,- ceous material tending to prevent the s allin off of the filling, when the filling is su jecte to the heat of a confiagration.

This specification signed this 21 day of June, 1926.

C. J. BATES, JR. CARL P. BARTELS. 

